KE LOGEM 928, Operation Manual

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Operation Manual V.34 - Modems, Version 07/97
AT
Chapter 3
AT Commands
3 AT Commands
3.1 General
The AT command set is an international standard developed by the US
modem manufacturer Hayes (Hayes standard). All commands (AT
commands) of the Hayes standard begin with an AT (ATTENTION).
The AT command set is used only for asynchronous serial mode operation.
You must run a terminal software on your computer to send AT modem
commands.
Please refer to the following conventions when working with AT
commands:
• the default data format is 1 start bit, 8 data bits, no parity,
1 stop bit (10 bit/character)
• the automatic baud rate detection operates up to 57600 bps
• a command line begins always with an AT or at
• a command line may include several commands
• a command line is terminated with a carriage return character
(CR, ASCII 13, RET, Return)
• the modem gives an OK after valid commands, an ERROR is
issued for invalid commands
Generally most data transmission software products feature a communi-
cation module that is compatible to the Hayes standard.
Please refer to the rules listed below when typing AT commands:
n stands for a decimal number
x is a text block
The command interpreter sets automatically a "0" whenever you do not
type the necessary decimal number for an AT command.